Powersupply makes high pitch noise

[Zell990]

Hey, i am helping my friend build a computer, and we seem to be having a problem.  When we put the power cable into the power supply, and turn the switch to ON, it makes a really high pitch noise.  This is really bugging the heck out of me because we are so close to getting this job done.

Specs:

AMD +2800
ASPIRE ATX Mid Tower Computer Case 420W Power Supply
XFX Geforce 7800GT
1gb corsair ram
320gb HD
CD-RW/DVD-RW drive

i really hope im not the only one with this problem, and i hope its something easy to fix, thanks, zell990

[GX1_Man]

Some el cheapo power supplies display this as well as other problems. These can include no name ones that come with an inexpensive case.

[Zell990]

so im guess what u are saying is that the Power supply is just crap?

[GX1_Man]

Who is the manufacturer? Do you have another to slip in there for a test? Is that a new case and PSU? If so, I would contact whoever you got it from.